نتایج جستجو برای: photosynthetic parameters
تعداد نتایج: 598969 فیلتر نتایج به سال:
A meta-analysis of photosynthesis–irradiance measurements was completed using data from the Ross Sea, Antarctica, using a total of 417 independent measurements. P m , the maximum, chlorophyll-specific, irradiancesaturated rate of photosynthesis, averaged 1.1± 0.06 μg C (μg Chl) h. Light-limited, chlorophyll-specific photosynthetic rates (α) averaged 0.030± 0.023 μg C (μg Chl) h (μmol quanta m s...
Introduction: Water deficit is one of the most important stress factors affecting plant growth and production in the worldwide, as due to series drought stress photosynthetic activities are negatively affected. Subsequently, a reduction will happen in the growth of leaves and plants, stomatal conductance and agricultural products. Accordingly, major concern exists in countries like Iran where w...
Mexican lime is one of the commercial citrus cultivars in the world, which is commonly used as a citrus rootstock in the southern regions of Iran. This cultivar is one of the most sensitive citrus cultivars to cold stress and is used as a cold-sensitive plant in many citrus studies. This study aimed to investigate the effect of melatonin (0 and 500 μM), mannitol (0 and 50 μM), acetic acid (0 an...
Selenium (Se) is an important microelement for plants and has been shown to improve growth under normal and stressed conditions. In this study, effect of Se and nano-selenium (N-Se) on hydroponically-grown tomato (Lycopersicum esculentum Mill. cv. ‘Halil’) on photosynthesis, antioxidant activity and total polyphenolic content was assessed. A factorial experiment with three temperatu...
The kinetic model has been developed for disserting the efficiency of solar energy conversion as a function of light intensity. A comparison of theory with experimental results shows that the model provides a satisfactory agreement. We have estimated the essential parameters of photosynthetic systems (the size of the photosynthetic antenna, the rate of electron transport, the correlation betwee...
This investigation was conducted to compare the photosynthetic indices in ironwood trees infected by Viscum album L. and healthy trees located both in stand and out of stand in plain forest of Tamishan, Nour city. In each position, five healthy and five infected trees were selected and photosynthetic parameters, stomatal conductance, transpiration and internal CO2 were examined. Results showed ...
Polyamines are small, ubiquitous, nitrogenous compounds that scavenge reactive oxygen species and stabilize the structure and function of the photosynthetic apparatus in response to abiotic stresses. Molecular details underlying polyamine-mediated photoprotective mechanisms are not completely resolved. This study investigated the role of spermidine (Spd) in the structure and function of the pho...
Mining natural variations is a major approach to identify new options to improve crop light use efficiency. So far, successes in identifying photosynthetic parameters positively related to crop biomass accumulation through this approach are scarce, possibly due to the earlier emphasis on properties related to leaf instead of canopy photosynthetic efficiency. This study aims to uncover rice (Ory...
Ladan Bayat 1, Mehri Askari*2 Department of Biology, Faculty of Science, Arak University (Received: 29 November 2012 Accepted: 4 May 2013) Abstract: Plant growth promoting rhizobacteria are beneficial bacteria that increase growth of plants and induce resistance to various stresses. SO2 air pollution is one of these stresses that is known as a strong damaging air pollutants. Pers...
Interest in the thermal acclimation of photosynthesis has been stimulated by the increasing relevance of climate change. However, little is known about intra-specific variations in thermal acclimation and its potential for breeding. In this article, we examined the difference in thermal acclimation between alfalfa (Medicago sativa) cultivars originating from contrasting origins, and sought to a...
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